Elisha d



(No Model.)

B. D. EAMES.

LOGOMOTIVE BRAKE.

Patented July 27, 1886.

UNITED Stra ns PATENT OFFICE.

ELISHA D. EAMES, OF \WATERTOWVN, NEV YORK.

LOCOMOTlVE-BRAKE.

SPECIFICATION forming part of Letters Patent No. 346,364, dated July 27, 1886.

Application filed February 16, lBtG. Serial No. 192,149.

To all whom it may concern:

Be it known that I, ELISHA D. EAMES, of Watertown, in the county of Jefferson and State of New York, have invented certain new and useful Improvements in Brakes for Locomotive-Engines, of which the following is a specification, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

The object of myinvention is to equalize the power applied to the brake-shoes on opposite sides of the wheels of a locomotive-engine; and the invention consists in the construction and arrangement of a system of levers hereinafter fully setforth.

In the accompanying drawings, Figure l is a side view of a portion of aswitching engine or locomotive having my invention applied thereto. Fig.2 is an end view showing the application of the invention to one wheel. Fig. 3 is an enlarged view of a detail.

Similar letters of reference indicate similar parts of the respective figures.

A Aare brake heads or blocks, to which the brake-shoes a are attached by any suitable means. The brake-head A is suspended by a wrought-iron hanger, B, at apoint nearly central'ot' said brake-head, the upper end of the hanger being pivoted to a support, 0. The brake-head A is suspended by a hanger, B, at a point, I), centrally of the brake-head, and also of the hanger; the upper end of said hanger being pivoted to a support, 0.

Dds a lever centrally pivoted at cl to the center of the brake-head A. The lower end of the lever D extends below the lower end of the brake-head A, and is attached to a beam,

E, extending across the engine to ad'uplicate lever attached to the brake-head of the opposite wheel.

The lower end of the hanger B, which extends below the brake-head A, is also connected to a beam, E, extending across to a duplicate hanger on the other side. The sys tem of brake mechanism and levers is the same on both sides of the locomotive. The two beams E E are connected by means of a rod, F, in two sections, provided with right and left threads, and a nut, G, for the purpose of adjusting the brake-shoes as theyare worn out, and regulating the amount of slack. The slotted slide or keeper d on the lever D is adj ust (No model.)

able,and serves to keep each end of the brakeshoe an equal distance from the periphery of the wheel. On the other side of the wheel the hanger B performs the same function as the lever D in so far as it serves to apply the brakeshoe to the wheel. This hanger or lever being suspended from the top instead of the center, it will be seen that such a keeper as that (1 cannot be used; for as the lower end of the hanger B is drawn toward the wheel it moves faster than the shoe A, and describes the arc of a circle of which its upper end is the center. I therefore on this side of the wheel (see the enlarged view, Fig. 3) place a keeper. 1), above the center of the block A, the keeper being firmly secured to the block. A setscrew, b, passes loosely through a hole in the keeper 1), and is screwed into the hanger B. A coiled spring, 1/, surrounds the screw between its head and the keeper 1), and by its elasticity keeps the top of the block A in proper position. The top of the lever D is connected, by means of a link or links, 4, to the short arm h of the bell-crank H. The long arm is attached by means of the link h to the diaphragm of the vacuum-chamber I.

I may employ air or steam as a motive power, instead ofa vacuum; or the vacuumchamber may be placed in a different position, which would require a somewhat different mode of connecting the lever D with the motive power.

The operation is as follows: Supposing the air to be exhausted from the vacuum-chamber, the diaphragm is forced up, by the external atmosphere with a pressure of, say, one thousand pounds, thus carrying up, by means of the link h, the long arm of the bell-crank H. The arms of this crank, bearing the relation to each other of, say, five to 1, will, by means of the link (1, force the upper end of the lever D forward with a pressure of five thousand pounds, thereby giving a pressure on the brake-head of ten thousand pounds, and a back-pressure on the lower end of the lever D of five thousand pounds, which is transmitted by means of the rod F to the lower end of the hanger B, thus giving a pressure of ten thousand pounds to the brake-head A, which is equal to the pressure applied to the brake-head A.

I have only described the application of the brakes to each side of one pair of wheels; but the same system of levers is applicable to two or more pairs of wheels.

Having described my invention, I claim- 1. The combination, with the brake-shoes of a locomotive-wheel and the source of the brakeapplying power, of a lever centrally pivoted to one of the brake-blocks, and connected at its upper end by a suitable system of levers to the source of power, and at its lower end by suitable connections to the center of the opposite brake block, whereby equal, pressure is applied to'both brake-shoes of the same wheel, substantially as specified.

2. The brake-blocks A A' hangers B B, I 5 adjustable connecting-rod F, lever D, and the adjustable. keepers d I), combined with a source of brake-applying power suitably connected with the lever D, substantially as set forth.

In testimony whereof 'I hereunto set hand and seal.

ELISHA D. EAMES.- [L. s.]

Vi tn esscs:

G. BRADFORD, CHARLES L. TI-I'URBER. 

